Pokémon Colosseum (ポケモンコロシアム, Pokemon Koroshiamu) is a role-playing video game developed by Genius Sonority, published by The Pokémon Company and distributed by Nintendo as part of the Pokémon series.
Pokémon fans can now battle their favorite Pokémon on the grand stage. Starring a brand new leading character, Pokémon, Colosseum offers a story mode that pits you against tough trainers who routinely catch damaged Pokémon. In Battle mode, you can use the Game Boy Advance cable to send your team from your Pokémon Ruby or Pokémon Sapphire Game Pak to your Gamecube, then witness the true potential of your team. Rescue Pokemon and watch them come to life in spectacular Colosseum battles.